VCCDO TELEMECANIQUE, VCCDO Datasheet - Page 5

• Manufacturer Part Number: VCCDO
• Description: LOAD BREAK SWITCH, 25A
• Manufacturer: TELEMECANIQUE

Specifications of VCCDO

• No. Of Poles: 3
• Contact Voltage Ac Max: 690V
• Contact Current Ac Max: 25A
• Approval Bodies: UL, CSA, GL
• Current Rating: 25A
• Depth Max: 330mm
• Depth Min: 300mm
• External Length / Height: 74mm
• External Width: 55mm

10
1
2
3
4
5
6
7
8
9
9/4
b
EN ISO 13849-1 is the Mean Time To
Failure (MTTF). This time value indicates
the number of years in which the fi rst
failure probably occurs.
devices to any fi rst failure.
λ and MTTF is:
repaired.
S = Severity of injury
F = Frequency and/or exposure time to the
hazard
P = Possibility of avoiding the hazard or
limiting the harm
Safety of Machinery:
Safety of Machinery:
p
p
p
S1 = Slight (normally reversible injury)
S2 = Serious (normally irreversible) injury including death
F1 = Seldom to less often and/or the exposure time is short
F2 = Frequent to continuous and/or the exposure time is long
P1 = Possible under specifi c conditions
P2 = Scarcely possible
The parameter for the failure rate in
MTTF
MTTF = mean time to failure [years]
– The mean time after installation of
– The general relation between
MTBF = mean time between failures
– Not relevant for devices which are not
– The MTTF
as the expectation of the mean time to
dangerous failure of a safety related
part of a control system.
d
=
mean time to dangerous failure
d
is defi ned in EN ISO 13849-1
MTTF = 1/λ
*
EN ISO 13849-1, defi nition of MTTF
*
EN ISO 13849-1 Risk graph and parameters
Starting point for
Starting point for
the evaluation of
the evaluation of
the contribution
the contribution
* In several application the realisation of performance level c by category 1 may not
be suffi cient. In this case a higher category e.g. 2 or 3 should be chosen.
a
a
b
b
c
c
d
d
e
e
of a safety
of a safety
to the risk
to the risk
reduction
reduction
function
function
Cat. B
Cat. B
DC avg =
DC avg =
0
0
Safety category level “EN 954-1”
Safety category level “EN 954-1”
MTTF
MTTF
MTTF
MTTF
MTTF
MTTF
d
d
d
d
d
d
of each channel = low
of each channel = low
of each channel = medium
of each channel = medium
of each channel = high
of each channel = high
Cat. 1
Cat. 1
DC avg =
DC avg =
0
0
S
S
S
S
1
1
2
2
Cat. 2
Cat. 2
DC avg =
DC avg =
low
low
F
F
F
F
F
F
F
F
1
1
2
2
1
1
2
2
Cat. 2
Cat. 2
DC avg =
DC avg =
medium
medium
Other versions: please consult your Schneider Electric agency.
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
1
1
2
2
1
1
2
2
1
1
2
2
1
1
2
2
Cat. 3
Cat. 3
DC avg =
DC avg =
low
low
performance
performance
level (PL
level (PL
Required
Required
a
a
b
b
c
c
d
d
e
e
d
Cat. 3
Cat. 3
DC avg =
DC avg =
medium
medium
r
r
)
)
High contribution
High contribution
Low contribution
Low contribution
to risk reduction
to risk reduction
to risk reduction
to risk reduction
Cat. 4
Cat. 4
DC avg =
DC avg =
high
high
1
1
1
1
2
2
3
3